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 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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 */

/*

 * @test

 * @bug 6692027

 * @summary Check that custom subclasses of QueryEval can be serialized.

 * @author Eamonn McManus

 */

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.lang.management.ManagementFactory;

import java.util.Set;

import java.util.concurrent.atomic.AtomicInteger;

import javax.management.MBeanServer;

import javax.management.MalformedObjectNameException;

import javax.management.ObjectName;

import javax.management.QueryEval;

import javax.management.QueryExp;

public class CustomQueryTest {

    public static interface CountMBean {

        public int getCount();

        public void increment();

    }

    public static class Count implements CountMBean {

        private AtomicInteger count = new AtomicInteger();

        public int getCount() {

            return count.get();

        }

        public void increment() {

            count.incrementAndGet();

        }

    }

    public static final ObjectName countName;

    static {

        try {

            countName = new ObjectName("d:type=Count");

        } catch (MalformedObjectNameException e) {

            throw new AssertionError(e);

        }

    }

    /* A query that calls the increment method of the Count MBean every time

     * it is evaluated.  If there is no ObjectName filter, the query will be

     * evaluated for every MBean in the MBean Server, so the count will be

     * incremented by the number of MBeans.

     */

    public static class IncrQuery extends QueryEval implements QueryExp {

        public boolean apply(ObjectName name) {

            try {

                getMBeanServer().invoke(countName, "increment", null, null);

                return true;

            } catch (Throwable t) {

                t.printStackTrace();

                System.exit(1);

                throw new AssertionError(); // not reached

            }

        }

    }

    public static void main(String[] args) throws Exception {

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();

        mbs.registerMBean(new Count(), countName);

        int mbeanCount = mbs.getMBeanCount();

        QueryExp query = new IncrQuery();

        Set<ObjectName> names = mbs.queryNames(null, query);

        assertEquals(mbeanCount, names.size());

        assertEquals(mbeanCount, mbs.getAttribute(countName, "Count"));

        ByteArrayOutputStream bout = new ByteArrayOutputStream();

        ObjectOutputStream oout = new ObjectOutputStream(bout);

        oout.writeObject(query);

        oout.close();

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());

        ObjectInputStream oin = new ObjectInputStream(bin);

        query = (QueryExp) oin.readObject();

        names = mbs.queryNames(null, query);

        assertEquals(mbeanCount * 2, mbs.getAttribute(countName, "Count"));

    }

    private static void assertEquals(Object expected, Object actual)

            throws Exception {

        if (!expected.equals(actual)) {

            String failure = "FAILED: expected " + expected + ", got " + actual;

            throw new Exception(failure);

        }

    }

}